A prestressed cable with a spring-loaded anchor head and a method of using the same

Abstract

The application discloses a prestressed anchor cable with a spring-pressing anchor head and a use method thereof, which comprises a plurality of steel strands, a plurality of wire supporting rings for fixing the steel strands, a spring-pressing anchor head fixedly connected with one end of the steel strands, and a control member for controlling opening and closing of the spring-pressing anchor head, wherein a grouting pipe is further arranged in the middle of the wire supporting ring; the spring-pressing anchor head comprises an anchor head body, at least three groups of spring pieces rotatably connected with the anchor head body and elastic elements for driving the spring pieces to open, and the spring pieces are uniformly arranged on the circumferential side surface of the anchor head body; the control member comprises a control ring sleeved at the end of the grouting pipe and a fixing member fixedly connected with the control ring through a connecting member, and the fixing member is used for limiting the spring pieces to open. The application has the advantages of compact structure, effectively simplified operation steps of anchoring engineering and improved pull-out resistance of anchoring.

Description

Technical Field

[0001] This invention belongs to the field of building support engineering technology, specifically relating to a prestressed anchor cable with a spring-loaded anchor head and its application method. Background Technology

[0002] Prestressed anchor cables are retaining structures that reinforce soil and rock masses to achieve a stable state or improve their internal stress conditions by applying tension to the anchor cables. By applying prestress to the anchor cables, deformation of the soil and rock masses can be actively controlled, and the stress state of the soil and rock masses can be adjusted, which is beneficial to the stability of the soil and rock masses. Because prestressed anchor cables can fully utilize and improve the strength of soil and rock masses and effectively control their deformation, they have been widely used in engineering projects such as foundation pits, slopes, tunnels, and mines.

[0003] In this project, anchor cables are primarily constructed using steel strands as reinforcement. Because steel strands are relatively soft, they tend to bend and embed themselves in the soil at the bottom of the borehole during lowering, leading to soil debris buildup and making it difficult to lower the cables to the designed depth. In practice, most projects rely on drilling rigs to force the cables to the designed depth, resulting in extremely low construction efficiency and potential safety hazards. In large-scale projects, guide devices are installed at the bottom of the anchor reinforcement, but these are often simple, temporary conical devices made from thin sheet metal. While this offers some advantages compared to not installing guide devices, it still has the following significant drawbacks: (1) Temporary processing of components results in large manufacturing errors and low efficiency; (2) The main connection with the reinforcement is by welding, which affects the performance of the reinforcement. Summary of the Invention

[0004] The purpose of this invention is to provide a prestressed anchor cable with a spring-loaded anchor head and its usage method, which solves the problem that during the current process of lowering the anchor cable into the borehole, it is easy to bend down and penetrate into the soil at the bottom of the borehole, which not only causes soil debris to be generated in the borehole, but also makes it difficult to lower it to the designed depth.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A prestressed anchor cable with a spring-loaded anchor head includes several steel strands and several wire-laying rings for fixing the steel strands, as well as a spring-loaded anchor head fixedly connected to one end of the steel strands and a control component for controlling the opening and closing of the spring-loaded anchor head. A grouting pipe is also provided in the middle of the wire-laying ring. The spring-loaded anchor head includes an anchor head body and at least three sets of spring pieces rotatably connected to the anchor head body and elastic elements that drive the spring pieces to open. The spring pieces are evenly arranged on the circumferential side of the anchor head body. The control component includes a control ring sleeved on the end of the grouting pipe and a fixing component fixedly connected to the control ring via a connector. The fixing component is used to restrict the opening of the spring clip.

[0006] Furthermore, the anchor head body is hollow inside, and the connector passes through the hollow interior of the anchor head body to connect and fix the member. The contact surface between the anchor head body and the spring piece is a conical surface, and the conical surface is provided with a plurality of grooves for accommodating the spring piece. The depth of the grooves is the same as the thickness of the spring piece.

[0007] Furthermore, a pivot is provided at the bottom of the groove, and the spring piece is rotatably connected to the anchor head body through the pivot.

[0008] Furthermore, the elastic element is a spring, one end of which is fixedly connected to the anchor head body and the other end is fixedly connected to the spring piece. When the fixing element is released, the elastic element can drive the spring piece to rotate on the anchor head body.

[0009] Furthermore, the connector consists of at least four steel wires, and the fixing component is a cap fitted onto the anchor head body. One end of each steel wire is fixedly connected to the cap, and the other end is fixedly connected to the control ring. When the control ring uses the steel wires to tighten the cap, the cap can restrict the opening of the spring clip.

[0010] Furthermore, the overhead wire ring is provided with several first through holes for accommodating the steel strands and second through holes for accommodating the grouting pipes, as well as several fins evenly arranged around the circumference of the overhead wire ring. The fins are used to position and fix the anchor cable in the anchor hole.

[0011] A method for using a prestressed anchor cable with a spring-loaded anchor head includes the following steps: S1): Drill anchor holes: According to the design dimensions in the drawings, use a drilling machine to drill anchor holes at the target location that meet the design depth; S2): Lowering the anchor cable: Lowering the spring-loaded anchor head into the anchor hole to the designed depth; S3): Open the spring clip: The grouting pipe is conveyed forward, causing the fixing member that tightens the grouting pipe to fall off the anchor head body, thereby opening the spring clip; S4): Grouting: After the spring is opened and the spring is engaged with the side wall of the anchor hole, grouting is performed using a grouting pipe to make the spring, anchor head and grout form a whole; S5): Test: Wait for the grout to solidify naturally, and then conduct a tensile test to see if it meets the design requirements.

[0012] Furthermore, in step S1, the diameter of the anchor hole is 5-10 mm larger than the maximum diameter of the fins on the circumferential side of the wire ring.

[0013] Furthermore, in step S2, before lowering the anchor cable, a certain number of steel strands need to be fixed according to design requirements, and fins are used for positioning and guidance in the anchor hole when lowering.

[0014] The beneficial effects of this invention are: 1. The steel strand, wire ring, and spring used in this invention can all be prefabricated in the factory, with good tolerance stability and high production efficiency.

[0015] 2. This invention simplifies the construction steps of anchoring projects. The fins can increase the positioning and guiding accuracy when the anchor is lowered. After it is in place, the spring will pop out and lock the anchor hole, so that grouting can be poured directly, which improves construction efficiency and increases pull-out resistance.

[0016] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the spring-loaded anchor head; Figure 2 This is a schematic diagram of the elastic anchor head structure; Figure 3 This is a schematic diagram of the cross-sectional structure of the spring-loaded anchor head; Figure 4 for Figure 3 A magnified view of part A; Figure 5 This is a schematic diagram of a overhead line ring. Explanation of reference numerals in the attached figures: 1. Wire ring; 11. Fin; 12. First through hole; 13. Second through hole; 2. Steel strand; 3. Grouting pipe; 4. Elastic anchor head; 41. Anchor head body; 411. Groove; 412. Shaft; 42. Elastic element; 43. Spring piece; 5. Control component; 51. Control ring; 52. Connector; 53. Fixing component. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention. Specific Implementation

[0019] like Figures 1 to 5The diagram shows an ultra-deep pile excavation device for cohesive soil, comprising several steel strands 2 and several stringing rings 1 for fixing the steel strands 2, as well as spring-loaded anchor heads 4 fixedly connected to one end of the steel strands 2 and control components 5 for controlling the opening and closing of the spring-loaded anchor heads 4. The stringing rings 1 are also provided with grouting pipes 3 in the middle. Specifically, the stringing rings 1 are provided with four first through holes 12 for accommodating the steel strands 2 and two through holes 13 for accommodating the grouting pipes 3, and four fins 11 evenly arranged around the circumference of the stringing rings 1. The fins 11 are used to position and fix the anchor cables in the anchor holes.

[0020] The spring-loaded anchor head 4 includes an anchor head body 41, three sets of spring pieces 43 rotatably connected to the anchor head body 41, and an elastic element 42 for driving the spring pieces 43 to open. Specifically, the elastic element 42 is a spring, one end of which is fixedly connected to the anchor head body 41, and the other end is fixedly connected to the spring piece 43. When the fixing member 53 is released, the elastic element 42 can drive the spring piece 43 to rotate on the anchor head body 41. The spring pieces 43 are evenly distributed on the circumferential side of the anchor head body 41. Specifically, the anchor head body 41 is hollow inside, and the connecting member 52 passes through the hollow interior of the anchor head body 41 to connect the fixing member 53. The contact surface between the anchor head body 41 and the spring piece 43 is a conical surface, and the conical surface is provided with a plurality of grooves 411 for accommodating the spring piece 43. The depth of the grooves 411 is the same as the thickness of the spring piece 43. Specifically, a rotating shaft 412 is provided at the bottom of the groove 411, and the spring piece 43 is rotatably connected to the anchor head body 41 through the rotating shaft 412.

[0021] The control component 5 includes a control ring 51 sleeved on the end of the grouting pipe 3 and a fixing component 53 fixedly connected to the control ring 51 via a connector 52. The fixing component 53 is used to restrict the opening of the spring piece 43. Specifically, the connector 52 consists of at least four steel wires, and the fixing component 53 is a cap sleeved on the anchor head body 41. One end of each steel wire is fixedly connected to the cap, and the other end is fixedly connected to the control ring 51. When the control ring 51 uses the steel wires to tighten the cap, the cap can restrict the opening of the spring piece 43.

[0022] A method for using a prestressed anchor cable with a spring-loaded anchor head includes the following steps: S1): Drill anchor holes: According to the design dimensions in the drawings, use a drilling machine to drill anchor holes at the target location that meet the design depth; specifically, the diameter of the anchor hole is 5-10mm larger than the maximum diameter of the fin measured around the circumference of the overhead line ring 1.

[0023] S2): Lowering the anchor cable: Lower the spring-loaded anchor head into the anchor hole to the designed depth; specifically, before lowering the anchor cable, a certain number of steel strands 2 should be fixed according to the design requirements, and fins should be used for positioning and guidance in the anchor hole when lowering.

[0024] S3): Open the spring clip 43: convey the grouting pipe 3 forward, so that the fastener (53) tightened by the grouting pipe 3 falls off the anchor head body 41, so that the spring clip 43 opens; S4): Grouting: After the spring plate 43 is opened and the spring plate 43 engages with the side wall of the anchor hole, grouting is performed using the grouting pipe 3 so that the spring plate 43, the anchor head and the grout form a whole. S5): Test: Wait for the grout to solidify naturally, and then conduct a tensile test to see if it meets the design requirements.

[0025] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A prestressed anchor cable with a spring-loaded anchor head, characterized in that: It includes several steel strands (2) and several wire rings (1) for fixing the steel strands (2), as well as spring-loaded anchor heads (4) fixedly connected to one end of the steel strands (2) and control components (5) for controlling the opening and closing of the spring-loaded anchor heads (4). The wire rings (1) are also provided with grouting pipes (3) in the middle. The spring-loaded anchor head (4) includes an anchor head body (41) and at least three sets of spring pieces (43) rotatably connected to the anchor head body (41) and elastic elements (42) for driving the spring pieces (43) to open. The spring pieces (43) are evenly arranged on the circumferential side of the anchor head body (41). The anchor head body (41) is hollow inside, and the connector (52) passes through the hollow interior of the anchor head body (41) to connect the fixing member (53). The contact surface between the anchor head body (41) and the spring pieces (43) is a conical surface. The conical surface is provided with a plurality of grooves (411) for accommodating the spring pieces (43). The depth of the grooves (411) is the same as the thickness of the spring pieces (43). A rotating shaft (412) is provided at the bottom of the grooves (411), and the spring pieces (43) are rotatably connected to the anchor head body (41) through the rotating shaft (412). The control component (5) includes a control ring (51) sleeved on the end of the grouting pipe (3) and a fixing component (53) fixedly connected to the control ring (51) via a connector (52). The fixing component (53) is used to restrict the opening of the spring (43). The connector (52) consists of at least four steel wires, and the fixing member (53) is a cap that is fitted onto the anchor head body (41). One end of the steel wire is fixedly connected to the cap, and the other end is fixedly connected to the control ring (51). When the control ring (51) uses the steel wire to tighten the cap, the cap can restrict the opening of the spring piece (43).

2. A prestressed anchor cable with a spring-loaded anchor head according to claim 1, characterized in that: The elastic element (42) is a spring. One end of the elastic element (42) is fixedly connected to the anchor head body (41), and the other end is fixedly connected to the spring piece (43). When the fixing member (53) is loosened, the elastic element (42) can drive the spring piece (43) to rotate on the anchor head body (41).

3. A prestressed anchor cable with a spring-loaded anchor head according to claim 1, characterized in that: The overhead line ring (1) is provided with a number of first through holes (12) for accommodating the steel strand (2) and a second through hole (13) for accommodating the grouting pipe (3) and a number of fins (11) evenly arranged around the circumference of the overhead line ring (1). The fins (11) are used to position and fix the anchor cable in the anchor hole.

4. A method of using a prestressed anchor cable with a spring-loaded anchor head as described in claim 3, characterized in that: Includes the following steps: S1): Drill anchor holes: According to the design dimensions in the drawings, use a drilling machine to drill anchor holes at the target location that meet the design depth; S2): Lowering the anchor cable: Lowering the spring-loaded anchor head into the anchor hole to the designed depth; S3): Open the spring clip (43): The grouting pipe (3) is conveyed forward, so that the fastener (53) tightened by the grouting pipe (3) falls off the anchor body (41), so that the spring clip (43) opens; S4): Grouting: After the spring plate (43) is opened and the spring plate (43) engages with the side wall of the anchor hole, grouting is carried out using the grouting pipe (3) so that the spring plate (43), the anchor head and the grout form a whole; S5): Test: Wait for the grout to solidify naturally, and then conduct a tensile test to see if it meets the design requirements.

5. The method of using a prestressed anchor cable with a spring-loaded anchor head according to claim 4, characterized in that: In step S1, the diameter of the anchor hole is 5-10 mm larger than the maximum diameter of the fin on the circumferential side of the wire ring (1).

6. The method of using a prestressed anchor cable with a spring-loaded anchor head according to claim 4, characterized in that: In step S2, before lowering the anchor cable, a certain number of steel strands (2) should be fixed according to the design requirements, and fins are used for positioning and guidance in the anchor hole.

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